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Finding the Fourth Proportional to 9,990.90, 13,787.49 and 5,453.58

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Solution

The fourth proportional to 9,990.90, 13,787.49 and 5,453.58 is: 7,525.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.90 : 13,787.49 = 5,453.58 : x
  2. Step 2: Convert to fraction form
    9,990.90/13,787.49 = 5,453.58/x
  3. Step 3: Cross multiply
    9,990.90x = 13,787.49 × 5,453.58
  4. Step 4: Simplify right side
    9,990.90x = 75,191,179.71
  5. Step 5: Solve for x
    x = 75,191,179.71/9,990.90
  6. Step 6: Final answer
    x = 7,525.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.